Atlas empowers SolidJS developers in 2026 to transform a wall of red `vitest (@solidjs/testing-library)` output into a prioritized list of distinct root causes, streamlining the debugging process with tools like `pnpm` and ensuring code quality with `prettier`. This approach helps you move from overwhelming test logs to actionable fixes efficiently.
How to run SolidJS `vitest` tests with Atlas
In 2026, Atlas runs your SolidJS `vitest (@solidjs/testing-library)` test suite using its `bash` tool, ensuring even slow suites complete by passing a generous timeout of 60000 milliseconds by default. This captures the full output for comprehensive analysis.
To initiate your SolidJS test suite, you'll use Atlas's `bash` tool. This allows Atlas to execute your standard `pnpm vitest` command, but with the added benefit of robust output handling. For instance, you might run `atlas bash "pnpm vitest --timeout=60000"`. Atlas ensures that even if your suite produces a massive amount of output, it's all captured. While the terminal display might truncate at 2000 lines or 50 KB, Atlas always writes the complete log to a retained file, providing you with the exact path. This means you're never working with a lossy tail, which is critical for thorough SolidJS test failure analysis.
How Atlas groups SolidJS `vitest` failures by root cause
Atlas helps SolidJS developers group `vitest` failures by distinct root causes, rather than individual test names, by leveraging its `grep` tool against the complete test log. This approach is crucial for efficiently identifying the 1-2 underlying issues causing many test failures.
After running your SolidJS `vitest` suite, the next step is to identify the distinct root causes of failures. Instead of sifting through hundreds of individual test failures, Atlas guides you to use its `grep` tool on the complete log file. This is where the full log, saved by Atlas, becomes invaluable. You can instruct Atlas to `grep` for specific error patterns or common SolidJS reactivity issues, such as those related to `createSignal`, `createMemo`, or `createEffect` graphs. This method allows you to quickly consolidate many seemingly disparate failures into a handful of core problems, making the triage process significantly more efficient and targeted for your SolidJS codebase.
How to prioritize SolidJS test fixes with Atlas `todowrite`
After identifying distinct root causes from your SolidJS `vitest` output, Atlas uses its `todowrite` tool to record each as a pending entry, ensuring no fix is forgotten. This creates a clear, actionable list, typically containing 3 to 5 high-priority items for immediate attention.
Once you've used `grep` to distill your SolidJS `vitest` failures into a list of distinct root causes, Atlas's `todowrite` tool helps you manage these fixes. For each unique problem, you'll create a `todowrite` entry, explicitly setting its status to `pending`. This ensures that every identified issue is tracked and accounted for, preventing critical bugs from being overlooked. This structured approach transforms a chaotic wall of red output into a manageable, prioritized list of tasks, allowing you to systematically address the most impactful problems in your SolidJS project first.
How Atlas supports iterative SolidJS bug fixing and code review
Atlas facilitates iterative bug fixing in SolidJS by allowing you to address one distinct root cause at a time using the `edit` tool, then re-running only affected `vitest` tests. Every change generates a unified diff for approval, ensuring 100% transparency before writing to disk.
With your prioritized list of SolidJS test failures, you can begin fixing them one by one. Atlas's `edit` tool allows you to make precise changes to your SolidJS `.tsx` components or `vite.config.ts` configuration. After each modification, you can re-run only the specific `vitest` tests affected by your change using `atlas bash "pnpm vitest path/to/affected/test.spec.tsx"`. This rapid feedback loop is crucial for efficient debugging. Before any changes are written to your SolidJS project, Atlas computes a unified diff and presents it for your explicit approval, ensuring you have full control. Atlas can also run `prettier` on any touched `.tsx` files to maintain consistent code style across your SolidJS codebase.
Atlas safety and transparency for SolidJS code changes
Atlas prioritizes safety and transparency for SolidJS developers, ensuring every tool call is permission-gated against allow, ask, and deny rules before execution. This includes operations like modifying `vite.config.ts` or adding `@solidjs/testing-library` tests, providing 100% control over agent actions.
Working with Atlas in your SolidJS project means you're always in control. Atlas operates with a strong emphasis on safety and transparency. Before any tool call, whether it's running `bash` commands, performing `grep` searches, or making `edit` changes to your SolidJS files, Atlas checks against your defined permission rules (allow, ask, deny). It drafts a plan in a read-only agent first, then asks for your explicit permission before switching to a build agent to execute changes. Furthermore, Atlas indexes your SolidJS code by AST declarations using tree-sitter, understanding your `createSignal`, `createMemo`, and `createEffect` graphs, which enhances its ability to suggest relevant fixes while respecting your codebase's structure. Every proposed file edit is presented as a unified diff for your approval, and changes can be snapshotted as git patches for easy rollback, offering unparalleled confidence when developing with SolidJS.
Step by step
- 01Initiate the SolidJS `vitest (@solidjs/testing-library)` test suite using Atlas's `bash` tool: `atlas bash "pnpm vitest --timeout=60000"`.
- 02If the output indicates truncation, use Atlas's `read` tool to view the complete `vitest` log file path provided in the header.
- 03Group the SolidJS test failures by distinct root cause using Atlas's `grep` tool on the saved log, focusing on patterns related to reactivity issues like `createSignal` or `createEffect`.
- 04Record each distinct root cause as a pending entry using Atlas's `todowrite` tool, creating an actionable list for your SolidJS project.
- 05Address one distinct cause at a time by using Atlas's `edit` tool to modify the relevant SolidJS `.tsx` component or utility file.
- 06After an edit, re-run only the affected `vitest` tests via Atlas's `bash` tool to quickly verify the fix without a full suite run, for example: `atlas bash "pnpm vitest src/components/MyComponent.spec.tsx"`.
- 07Review the unified diff presented by Atlas for your SolidJS code changes, ensuring accuracy before approval.
- 08Instruct Atlas to run `prettier` on any touched SolidJS `.tsx` files to maintain consistent formatting standards.
Frequently asked questions
- How does Atlas handle large `vitest` outputs in SolidJS?
- Atlas's `bash` tool truncates large `vitest` outputs at 2000 lines or 50 KB in the terminal, but always writes the complete log to a retained file, providing the path for full review with the `read` tool.
- Can Atlas help me find reactivity bugs in SolidJS components?
- Yes, Atlas indexes your SolidJS `createSignal`, `createMemo`, and `createEffect` graph using tree-sitter, allowing it to identify and help fix common reactivity bugs, such as those caused by destructured props.
- How does Atlas ensure code quality when fixing SolidJS tests?
- Atlas computes a unified diff for every file edit and surfaces it for your approval before writing. It can also run `prettier` on touched `.tsx` files to maintain consistent formatting standards across your SolidJS codebase.
- What SolidJS test runner does Atlas support?
- Atlas fully supports `vitest (@solidjs/testing-library)` as the test runner for SolidJS projects, integrating direct with your existing `vite.config.ts` setup and `vite-plugin-solid`.
- Is Atlas safe to use with my SolidJS codebase?
- Yes, Atlas is designed for safety. Every tool call is permission-gated against allow, ask, and deny rules, and it drafts a plan in a read-only agent before asking for approval to make changes, ensuring you retain full control.
- How does Atlas help prioritize SolidJS test failures?
- Atlas encourages grouping `vitest` failures by distinct root causes using `grep` on the full log, then recording these as `todowrite` entries with a `pending` status, allowing you to focus on the most impactful fixes first.
- Can Atlas help me with SolidStart routes?
- Yes, Atlas can read your SolidStart routes in addition to your core SolidJS reactivity graph, providing a more complete understanding of your application's structure for debugging and development tasks.
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